Not.
If you talk about datasnap, the term n-tier is rising. It means that you create multiple clients without knowledge of the database structucure. All your communication to the database runs with the de server application. The client is doing a request to the serverapp. This is talking to the datebase and other things and give you a result back. Datasnap is working with a tcpip layer of itself.
Now your creating a 'fat client/server' to communicate to the database. Al copies do the same. But using datasnap the communication is put on on application. Advantage: If there's a database structure modify or a function must be programmed differently, only the server has to be updated.
There are a few other n-tier tools for Lazarus: MORMot, Tiopf, RestDB, KBMmw (expirimental)